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Did people just pour dirt into the sea and build on top? I'm not being sarcastic, how did this happen?
Unironically yes they did exactly that. If memory serves a good amount came from Breeds and Bunker hill (just North of the frame).
The fill came mostly from Needham
The firm of Goss and Munson extended railroad lines to quarries in Needham, Massachusetts, 9 miles (14 km) away; a 35-car train carrying gravel and other fill arrived every 45 minutes, day and night.[11] When the Needham gravel pits were exhausted, additional fill was found in Canton, Dedham, Hyde Park, and Westwood.[12] William Dean Howells recalled "the beginnings of Commonwealth Avenue, and the other streets of the Back Bay, laid out with their basements left hollowed in the made land, which the gravel trains were yet making out of the westward hills."[13]
Thanks for the correction.
wait Bunker Hill is that trading place from FO4...
that's a common practice in most of the coastal megapolises
you can find a long list on https://en.wikipedia.org/wiki/Land_reclamation
Yes, but mainly a mix that wouldn't be washed away.
Well, not just dirt. They also threw some tea in there